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If the work is done on an adiabatic wall, then which of the following is true?(a) ΔU = -W(b) ΔU = W(c) ΔU + W = 0(d) ΔU = -WThis question was posed to me by my school teacher while I was bunking the class.I want to ask this question from Thermodynamic Terms topic in chapter Thermodynamics of Chemistry – Class 11

Answer»

The correct option is (b) ΔU = W

To explain: In an adiabatic process, the total energy is always zero. We have that ΔH = ΔU + W, as ΔH is zero, we get ΔU + W = 0; ΔU = -W. But as work is done on the SYSTEM by OBSERVING no heat W BECOMES NEGATIVE, so ΔU = -(-)W = W. Hence ΔU = W.



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